Sugar yields from dilute sulfuric acid and sulfur dioxide pretreatments and subsequent enzymatic hydrolysis of switchgrass

Jian Shi, Mirvat A. Ebrik, Charles E. Wyman

Research output: Contribution to journalArticlepeer-review

62 Scopus citations

Abstract

Dacotah switchgrass was pretreated with sulfuric acid concentrations of 0.5, 1.0, and 2.0wt.% at 140, 160, and 180°C and with 1 and 3wt.% sulfur dioxide at 180°C over a range of times. Sulfur dioxide loadings of 0%, 1%, 3%, 5%, and 10%wt.% of dry biomass were also tested at 180°C for 10min. Sugar yields were tracked for pretreatment and subsequent enzymatic hydrolysis to identify conditions for the highest total sugar yields. Pretreatment with 1wt.% dilute sulfuric acid at 140°C for 40min followed by enzymatic hydrolysis with 48.6mg enzyme/g initial glucan in raw biomass resulted in ∼86% of theoretical yield for glucose and xylose combined. For sulfur dioxide pretreatment, the highest total sugar yield of about 87% occurred at 5% SO 2 for 10min and 180°C. However, xylose yields were higher at shorter times and glucose yields at longer times.

Original languageEnglish
Pages (from-to)8930-8938
Number of pages9
JournalBioresource Technology
Volume102
Issue number19
DOIs
StatePublished - Oct 2011

Bibliographical note

Funding Information:
Support from the US Department of Energy Office of the Biomass Program (contract DE-FG36-07GO17102) made this research possible. We are also grateful to the Center for Environmental Research and Technology of the Bourns College of Engineering (CE-CERT) at the University of California, Riverside for providing key equipment and facilities. We thank the Biomass Refining Consortium for Applied Fundamentals and Innovation (CAFI) team of Auburn, Michigan State, Purdue, and Texas A&M Universities, the University of California at Riverside (UCR), the National Renewable Energy Laboratory, Ceres Inc., and Genencor, a Danisco Division, for providing samples, suggestions, and other invaluable assistance for this research. Special thanks go to our colleagues Dr. Rajeev Kumar, Dr. Bin Yang, and Tim Redmond for lab assistance, suggestions, and comments. The corresponding author is grateful to the Ford Motor Company for funding the Chair in Environmental Engineering at the Center for Environmental Research and Technology of the Bourns College of Engineering at UCR that augments support for many projects such as this.

Keywords

  • Biofuels
  • Dilute sulfuric acid
  • Pretreatment
  • Sulfur dioxide
  • Switchgrass

ASJC Scopus subject areas

  • Bioengineering
  • Environmental Engineering
  • Renewable Energy, Sustainability and the Environment
  • Waste Management and Disposal

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